// This file is part of Eigen, a lightweight C++ template library
// for linear algebra.
//
// Copyright (C) 2012 Chen-Pang He <jdh8@ms63.hinet.net>
//
// This Source Code Form is subject to the terms of the Mozilla
// Public License v. 2.0. If a copy of the MPL was not distributed
// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.

#ifndef EIGEN_GENERAL_RANK1UPDATE_H
#define EIGEN_GENERAL_RANK1UPDATE_H

namespace internal {

/* Optimized matrix += alpha * uv' */
template<typename Scalar, typename Index, int StorageOrder, bool ConjLhs, bool ConjRhs>
struct general_rank1_update;

template<typename Scalar, typename Index, bool ConjLhs, bool ConjRhs>
struct general_rank1_update<Scalar, Index, ColMajor, ConjLhs, ConjRhs>
{
	static void run(Index rows, Index cols, Scalar* mat, Index stride, const Scalar* u, const Scalar* v, Scalar alpha)
	{
		typedef Map<const Matrix<Scalar, Dynamic, 1>> OtherMap;
		typedef typename conj_expr_if<ConjLhs, OtherMap>::type ConjRhsType;
		conj_if<ConjRhs> cj;

		for (Index i = 0; i < cols; ++i)
			Map<Matrix<Scalar, Dynamic, 1>>(mat + stride * i, rows) +=
				alpha * cj(v[i]) * ConjRhsType(OtherMap(u, rows));
	}
};

template<typename Scalar, typename Index, bool ConjLhs, bool ConjRhs>
struct general_rank1_update<Scalar, Index, RowMajor, ConjLhs, ConjRhs>
{
	static void run(Index rows, Index cols, Scalar* mat, Index stride, const Scalar* u, const Scalar* v, Scalar alpha)
	{
		general_rank1_update<Scalar, Index, ColMajor, ConjRhs, ConjRhs>::run(rows, cols, mat, stride, u, v, alpha);
	}
};

} // end namespace internal

#endif // EIGEN_GENERAL_RANK1UPDATE_H
